docs: fix vue example

examples/nuxt-example/components/ui/form/FormLabel.vue

@@ -0,0 +1,23 @@
+<script lang="ts" setup>
+import type { HTMLAttributes } from 'vue'
+import type { LabelProps } from 'radix-vue'
+import { useFormField } from './useFormField'
+import { cn } from '@/lib/utils'
+import { Label } from '@/components/ui/label'
+
+const props = defineProps<LabelProps & { class?: HTMLAttributes['class'] }>()
+
+const { error, formItemId } = useFormField()
+</script>
+
+<template>
+  <Label
+    :class="cn(
+      error && 'text-destructive',
+      props.class,
+    )"
+    :for="formItemId"
+  >
+    <slot />
+  </Label>
+</template>